our current experimental Neutrino branch

git-svn-id: file:///home/bas/coolstream_public_svn/THIRDPARTY/applications/neutrino-experimental@27 e54a6e83-5905-42d5-8d5c-058d10e6a962

src/nhttpd/yhttpd_mods/mod_sendfile.cpp

@@ -0,0 +1,214 @@
+//=============================================================================
+// YHTTPD
+// Module: SendFile (mod_sendfile)
+//-----------------------------------------------------------------------------
+// Send a File (main) with given path and filename.
+// It procuced a Response-Header (SendHeader).
+// It supports Client caching mechanism "If-Modified-Since".
+//-----------------------------------------------------------------------------
+// RFC 2616 / 14.25 If-Modified-Since
+//
+//   The If-Modified-Since request-header field is used with a method to
+//   make it conditional: if the requested variant has not been modified
+//   since the time specified in this field, an entity will not be
+//   returned from the server; instead, a 304 (not modified) response will
+//   be returned without any message-body.
+//
+//       If-Modified-Since = "If-Modified-Since" ":" HTTP-date
+//   An example of the field is:
+//
+//       If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT
+//
+//   A GET method with an If-Modified-Since header and no Range header
+//   requests that the identified entity be transferred only if it has
+//   been modified since the date given by the If-Modified-Since header.
+//   The algorithm for determining this includes the following cases:
+//
+//      a) If the request would normally result in anything other than a
+//         200 (OK) status, or if the passed If-Modified-Since date is
+//         invalid, the response is exactly the same as for a normal GET.
+//         A date which is later than the server's current time is
+//         invalid.
+//
+//      b) If the variant has been modified since the If-Modified-Since
+//         date, the response is exactly the same as for a normal GET.
+//
+//      c) If the variant has not been modified since a valid If-
+//         Modified-Since date, the server SHOULD return a 304 (Not
+//         Modified) response.
+//         
+//  yjogol: ASSUMPTION Date-Format is ONLY RFC 1123 compatible!       
+//=============================================================================
+
+// system
+#include <cstdio>
+#include <fcntl.h>
+#include <pthread.h>
+#include <sys/stat.h>
+// yhttpd
+#include "yconfig.h"
+#include "ytypes_globals.h"
+#include "helper.h"
+#include "mod_sendfile.h"
+
+//=============================================================================
+// Initialization of static variables
+//=============================================================================
+CStringList CmodSendfile::sendfileTypes;
+
+//=============================================================================
+// Constructor & Destructor & Initialization
+//=============================================================================
+
+//-----------------------------------------------------------------------------
+// HOOK: Response Prepare Handler
+// Response Prepare Check.
+//-----------------------------------------------------------------------------
+THandleStatus CmodSendfile::Hook_PrepareResponse(CyhookHandler *hh)
+{
+	hh->status = HANDLED_NONE;
+
+	int filed;
+	log_level_printf(4,"mod_sendfile prepare hook start url:%s\n",hh->UrlData["fullurl"].c_str());	
+	std::string mime = sendfileTypes[hh->UrlData["fileext"]];
+	if(mime != "")
+	{
+		//TODO: Check allowed directories / actually in GetFileName
+		// build filename
+		std::string fullfilename = GetFileName(hh, hh->UrlData["path"], hh->UrlData["filename"]);
+		
+		if( (filed = OpenFile(hh, fullfilename) ) != -1 ) //can access file?
+		{
+			struct stat statbuf;
+			hh->LastModified = (time_t)0;
+			// It is a regular file?
+			fstat(filed,&statbuf);
+			if (S_ISREG(statbuf.st_mode))
+			{
+				// get file size and modify date
+				hh->ContentLength = statbuf.st_size;
+				hh->LastModified = statbuf.st_mtime;
+			}
+			close(filed);
+
+			// check If-Modified-Since
+			time_t if_modified_since = (time_t)-1;
+			if(hh->HeaderList["If-Modified-Since"] != "")
+			{
+				struct tm mod;
+				if(strptime(hh->HeaderList["If-Modified-Since"].c_str(), RFC1123FMT, &mod) != NULL)
+				{
+					mod.tm_isdst = 0; // daylight saving flag! 
+					if_modified_since = mktime(&mod);
+				}
+			}
+	
+			// normalize obj_last_modified to GMT
+			struct tm *tmp = gmtime(&(hh->LastModified));
+			time_t LastModifiedGMT = mktime(tmp);
+			bool modified = (if_modified_since == (time_t)-1) || (if_modified_since < LastModifiedGMT);
+	
+			// Send normal or not-modified header
+			if(modified)
+			{
+				hh->SendFile(fullfilename);
+				hh->ResponseMimeType = mime;
+			}
+			else
+				hh->SetHeader(HTTP_NOT_MODIFIED, mime, HANDLED_READY);
+		}
+		else
+		{
+			aprintf("mod_sendfile: File not found. url:(%s)\n", hh->UrlData["url"].c_str());
+			hh->SetError(HTTP_NOT_FOUND);
+		}
+	}
+	log_level_printf(4,"mod_sendfile prepare hook end status:%d\n",(int)hh->status);	
+	
+	return hh->status;
+}
+
+//-----------------------------------------------------------------------------
+// HOOK: Hook_ReadConfig 
+// This hook ist called from ReadConfig
+//-----------------------------------------------------------------------------
+THandleStatus CmodSendfile::Hook_ReadConfig(CConfigFile *Config, CStringList &ConfigList)
+{
+	std::string exttypes = Config->getString("mod_sendfile.mime_types", HTTPD_SENDFILE_EXT);
+	ConfigList["mod_sendfile.mime_types"] = exttypes;
+
+	bool ende = false;
+	std::string item, ext, mime;
+	sendfileTypes.clear();
+	while(!ende)
+	{
+		if(!ySplitStringExact(exttypes,",",item,exttypes))
+			ende = true;
+		if(ySplitStringExact(item,":",ext,mime))
+		{
+			ext = trim(ext);
+			sendfileTypes[ext] = trim(mime);
+		}
+	}
+	return HANDLED_CONTINUE;
+}
+
+//-----------------------------------------------------------------------------
+// Send File: Build Filename
+// First Look at PublicDocumentRoot than PrivateDocumentRoot than pure path
+//-----------------------------------------------------------------------------
+std::string CmodSendfile::GetFileName(CyhookHandler *hh, std::string path, std::string filename)
+{
+	std::string tmpfilename;
+	if(path[path.length()-1] != '/')
+		tmpfilename = path + "/" + filename;
+	else
+		tmpfilename = path + filename;
+
+	if( access(std::string(hh->WebserverConfigList["PublicDocumentRoot"] + tmpfilename).c_str(),4) == 0)
+		tmpfilename = hh->WebserverConfigList["PublicDocumentRoot"] + tmpfilename;
+	else if(access(std::string(hh->WebserverConfigList["PrivatDocumentRoot"] + tmpfilename).c_str(),4) == 0)
+		tmpfilename = hh->WebserverConfigList["PrivatDocumentRoot"] + tmpfilename;
+#ifdef Y_CONFIG_FEATUE_SENDFILE_CAN_ACCESS_ALL
+	else if(access(tmpfilename.c_str(),4) == 0)
+		;
+#endif
+	else
+	{
+		return "";
+	}
+	return tmpfilename;
+}
+//-----------------------------------------------------------------------------
+// Send File: Open File and check file type
+//-----------------------------------------------------------------------------
+int CmodSendfile::OpenFile(CyhookHandler *hh, std::string fullfilename)
+{
+	int  fd= -1;
+	std::string tmpstring;
+	if(fullfilename.length() > 0)
+	{
+		fd = open( fullfilename.c_str(), O_RDONLY );
+		if (fd<=0)
+		{
+			aprintf("cannot open file %s: ", fullfilename.c_str());
+			dperror("");
+		}
+	}
+	return fd;
+}
+//-----------------------------------------------------------------------------
+// Send File: Determine MIME-Type fro File-Extention
+//-----------------------------------------------------------------------------
+std::string CmodSendfile::GetContentType(std::string ext)
+{
+	std::string ctype = "text/plain";
+	ext = string_tolower(ext);
+	for (unsigned int i = 0;i < (sizeof(MimeFileExtensions)/sizeof(MimeFileExtensions[0])); i++)
+		if (MimeFileExtensions[i].fileext == ext)
+		{
+			ctype = MimeFileExtensions[i].mime;
+			break;
+		}	
+	return ctype;
+}